A French sleeping-car attending with an eye for the ladies hooks up with a wealthy widow and they get married. What he doesn't know is that she married him because she wants to stay in France. Complications ensue.

During the First World War, before joining a squadron at the front in 1918, Herbillon (Jean-Pierre Aumont) has a liaison with Helene (Annabella), a married woman. The young man discovers that his mistress is none other than the wife of Maury (Charles Vanel), an aviator friend.

Also known as Lilac, this early Anatole Litvak-directed talkie was based on a play by Tristan Bernard and Charles Henry Hirsch. The story bears traces of the Bertold Brecht-Weill piece The Threepenny Opera, with heroine Lilac (Marcelle Romeo) consorting with the criminal scum of Paris. Lilac falls in love with a handsome detective (Andre Luguet), but he doesn't let his emotions stand in the way of his duty, and in the end he reluctantly turns her over to the authorities. At $120,000, Coeur de Lilas was one of the most expensive movies to come out of France in 1931, but it more than made back its cost at the box-office.